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USS Flat Washer

Low carbon USS flat washers are used under bolt heads or nuts to increase the bearing surface area, or to offer protection so that the nut or bolt can be rotated without distortion of the bearing surface. Flat washers are also used to give tightness to a joint, to prevent leakage, and especially to distribute pressure under the head of a bolt or nut. Dimensional specifications are governed by ASME B18.21.1. USS (United States Standard) flat washers have a larger outer diameter than SAE (Society of Automotive Engineers) flat washers, and can be utilized in nearly any application. ASTM F844 covers the standard specifications for unhardened steel flat washers for general use.

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Governing Standards
Dimensional Specifications

Dimensional Specifications

Dimensional SpecificationsUSS Flat Washer

Per ASME B18.21.1-2009
Size	Nominal	A			B			C
		Inside Diameter			Outside Diameter			Mean Section Thickness
		Basic	Tolerance Plus	Tolerance Minus	Basic	Tolerance Plus	Tolerance Minus	Basic	Max	Min
		Basic	Tolerance Plus	Tolerance Minus	Basic	Tolerance Plus	Tolerance Minus	Basic	Max	Min
#6	0.1380	0.1560	0.0080	0.0050	0.3750	0.0150	0.0050	0.0490	0.0650	0.0360
#8	0.1640	0.1880	0.0080	0.0050	0.4380	0.0150	0.0050	0.0490	0.0650	0.0360
#10	0.1900	0.2190	0.0080	0.0050	0.5000	0.0150	0.0050	0.0490	0.0650	0.0360
#12	0.2160	0.2500	0.0150	0.0050	0.5620	0.0150	0.0050	0.0650	0.0800	0.0510
1/4	0.2500	0.3120	0.0150	0.0050	0.7340	0.0150	0.0070	0.0650	0.0800	0.0510
5/16	0.3125	0.3750	0.0150	0.0050	0.8750	0.0300	0.0070	0.0830	0.1040	0.0640
3/8	0.3750	0.4380	0.0150	0.0050	1.0000	0.0300	0.0070	0.0830	0.1040	0.0640
7/16	0.4375	0.5000	0.0150	0.0050	1.2500	0.0300	0.0070	0.0830	0.1040	0.0640
1/2	0.5000	0.5620	0.0150	0.0050	1.3750	0.0300	0.0070	0.1090	0.1320	0.0860
9/16	0.5625	0.6250	0.0150	0.0050	1.4690	0.0300	0.0070	0.1090	0.1320	0.0860
5/8	0.6250	0.6880	0.0300	0.0070	1.7500	0.0300	0.0070	0.1340	0.1600	0.1080
3/4	0.7500	0.8120	0.0300	0.0070	2.0000	0.0300	0.0070	0.1480	0.1770	0.1220
7/8	0.8750	0.9380	0.0300	0.0070	2.2500	0.0300	0.0070	0.1650	0.1920	0.1360
1	1.0000	1.0625	0.0300	0.0070	2.5000	0.0300	0.0070	0.1650	0.1920	0.1360
1 1/8	1.1250	1.2500	0.0300	0.0070	2.7500	0.0300	0.0070	0.1650	0.1920	0.1360
1 1/4	1.2500	1.3750	0.0300	0.0070	3.0000	0.0300	0.0070	0.1650	0.1920	0.1360
1 3/8	1.3750	1.5000	0.0450	0.0100	3.2500	0.0450	0.1000	0.1800	0.2130	0.1530
1 1/2	1.5000	1.6250	0.0450	0.0100	3.5000	0.0450	0.0100	0.1800	0.2130	0.1530
1 5/8	1.6250	1.7500	0.0450	0.0100	3.7500	0.0450	0.0100	0.1800	0.2130	0.1530
1 3/4	1.7500	1.8750	0.0450	0.0100	4.0000	0.0450	0.0100	0.1800	0.2130	0.1530
1 7/8	1.8750	2.0000	0.0450	0.0100	4.2500	0.0450	0.0100	0.1800	0.2130	0.1530
2	2.0000	2.1250	0.0450	0.0100	4.5000	0.0450	0.0100	0.1800	0.2130	0.1530
2 1/4	2.2500	2.3750	0.0450	0.0100	4.7500	0.0450	0.0100	0.2200	0.2480	0.1930
2 1/2	2.5000	2.6250	0.0450	0.0100	5.0000	0.0450	0.0100	0.2380	0.2800	0.2100
2 3/4	2.7500	2.8750	0.0650	0.0100	5.2500	0.0650	0.0100	0.2590	0.3100	0.2280
3	3.0000	3.1250	0.0650	0.0100	5.5000	0.0650	0.0100	0.2840	0.3270	0.2490

All dimensions are in inches.

USS Flat Washer

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Diameter Inside Diameter Outside Diameter Thickness Item # Availability Price Quantity UOM

1 3/8

1.5000

3.2500

0.1800

WFBL137

In Stock

$0.35721/EA

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1 3/8 LOW CARBON STEEL USS FLAT WASHER

$0.35721/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$0.35721/ EA
30	$0.33698/ EA
120	$0.29712/ EA
530	$0.20905/ EA

1 1/2

1.6250

3.5000

0.1800

WFBL150

In Stock

$1.3802/EA

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1 1/2 LOW CARBON STEEL USS FLAT WASHER

$1.3802/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$1.3802/ EA
30	$1.30206/ EA
100	$1.14805/ EA
500	$0.80773/ EA

1 5/8

1.7500

3.7500

0.1800

WFBL162

In Stock

$1.732/EA

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1 5/8 LOW CARBON STEEL USS FLAT WASHER

$1.732/EA

Qty

In Stock

Product Detail

Quantity	Price
Quantity	Price
1	$1.732/ EA
25	$1.63394/ EA
90	$1.44067/ EA
500	$1.01361/ EA

1 3/4

1.8750

4.0000

0.1800

WFBL175

In Stock

$3.16719/EA

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1 3/4 LOW CARBON STEEL USS FLAT WASHER

$3.16719/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$3.16719/ EA
25	$2.98788/ EA
80	$2.63445/ EA
500	$1.85352/ EA

1 7/8

2.0000

4.2500

0.1800

WFBL187

In Stock

$2.52906/EA

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1 7/8 LOW CARBON STEEL USS FLAT WASHER

$2.52906/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$2.52906/ EA
25	$2.38588/ EA
70	$2.10366/ EA
500	$1.48007/ EA

2.1250

4.5000

0.1800

WFBL200

In Stock

$1.73796/EA

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2 LOW CARBON STEEL USS FLAT WASHER

$1.73796/EA

Qty

In Stock

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Quantity	Price
Quantity	Price
1	$1.73796/ EA
25	$1.63957/ EA
70	$1.44563/ EA
500	$1.0171/ EA

USS Flat Washer

Technical Data

Governing Standards

Governing StandardsUSS Flat Washer

Dimensional Specifications

Dimensional SpecificationsUSS Flat Washer

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Thickness

Outside Diameter

Inside Diameter

1 3/8 LOW CARBON STEEL USS FLAT WASHER

1 1/2 LOW CARBON STEEL USS FLAT WASHER

1 5/8 LOW CARBON STEEL USS FLAT WASHER

1 3/4 LOW CARBON STEEL USS FLAT WASHER

1 7/8 LOW CARBON STEEL USS FLAT WASHER

2 LOW CARBON STEEL USS FLAT WASHER

ASTM F844	Covers standard, unhardened steel washers for general use.
ASME B18.21.1	Covers the dimensional requirements, physical properties, and related test methods for helical spring-lock washers (#0 through 3 inches), tooth-lock washers (#2 through 1 ¼ inches), and plain washers (#0 through 3 inches).